MLX90121 查看數據表（PDF） - Melexis Microelectronic Systems

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MLX90121

13.56MHz RFID Transceiver

Melexis Microelectronic Systems  

MLX90121

13.56MHz RFID Transceiver

Features and Benefits

Conforms with ISO14443B(1)

Conforms with ISO15693

Programmable encoder and decoder

Low external component count

(1) RATP / Innovatron Technology

Applications

Portable data terminals

Access control readers

Contact-less payment terminals

Smart label printer

Ordering Information

Part No.

MLX90121

Temperature Suffix

E (-40°C to 85°C)

Package Code

FR (SSOP20, 209 mils)

Option code

FSK

1. Functional Diagram

Attenuation

resistor

Impedance

matching

RX

Analog

functions

TX

MLX90121

Digital

functions

Serial data

interface

Microcontroller

2. Description

The MLX90121 is an ISO compliant 13.56MHz

RFID transceiver integrated circuit.

The main features include user selectable

modulation depth in write mode, whereas single

sub-carrier, FSK and PSK modulations are

recognized in the read mode.

The receiver is based on a diode envelope

detector, followed by an IF filter and amplifier. A

logarithmic amplifier is used for single sub-

carrier detection, ensuring fast and clean data

recovery. The limiting output of the log amp is

used for FSK and PSK recovery.

The transmitter uses a built in open drain output

transistor, which can provide up to 250 miliwatts

of RF power to a 50 ohms load with a 5 volts

power supply using the recommended matching

network. This is suitable for most short to mid

range applications. A simplified antenna and

matching network can be used, at the expense

of a reduced reading range, for example in

hand-held reader applications.

The chip is configured with a serial interface. A

synchronization signal is available when the

majority voting is used.

Digital part contains FSK (423 / 484kHz) and

PSK (847kHz) decoders and a programmable

encoder to facilitate data handling with a low

cost microcontroller. The encoder can be

programmed with 6 different patterns.

The chip can also be used as an analog front-

end, in direct mode.

3901090121

Rev. 009

Page 1 of 26

Data Sheet

Sept.-2009

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